A safe and proven system – simple and reliable principle
The dynamic measurement technology is based on the long experience from Dynagrade which was first installed 20 years ago. The first Precigrader system was running in 2006. Since then, millions of boards have also passed this system type. A spring-loaded impact mechanism (a kind of hammer) in the main unit is activated by the cross-conveyed lumber/timber. Each stroke generates vibrations in the wood, and the generated sound is captured by robust high-tech microphones. At the same time, the length, size and wood density of the piece is measured (length and size alternatively imported from the PLC). The timber piece rests on special low-friction supports during the measurement itself, during the continuous operation.
Precigrader is approved in accordance with the European standard EN 14081 for machine strength grading of structural timber (C-grades) and glulam laminations (T-grades according to EN 14080). Precigrader is also approved in Canada and in the USA for MSR grading. Precigrader is also approved for grading of glulam laminations according to the Japanese standard JAS. Grading of Australian MGP grades is also done today with Precigrader in Europe for lumber export to Australia. Precigrader can also be used for other quality control where the wood E-modulus (MOE) and wood density are in focus rather than the strength grading.